Figure 3. Th failure load method for efficient so A closer l approach. I model. The show a sin energy rele singularity well-know joint conce weak inter have a stro release rate predicted b the energy stresses wi bound for Then the l load of the directly at deficiencie 4. Result In this sect the geomet discussed. comparison the failure 4.1. Param For the par adherend a he stress distri d and crack r restricted olution is ob look at the In Figure 3 e most rema ngular beha ease rate do y of the reen wn crack tip erning the s rface model ong effect on e for a load by the stres y criterion. ill increase the finite c lowest load e considere position 0 es of the we ts tion results trical param Furthermo n only mate load. meter study rameter stu and the epox ibution at a str length given length mus optimizatio btained usin e optimizati the optimiz arkable char avior, as it oes not start ntrant corne singularity stresses and ls. It will be n the results ding that is s criterion i If the load as well. W crack length satisfying ed joint. It 0, which is eak interface of the outl meters of the ore a comp erial param y dy a typica xy are: xE = ress concentra n for the case st be follow on. Due to ng the Comp ion problem zation probl racteristics is known t at zero for er. The sing y. These def d the energy e seen in th s. Figure 3 lower than is lower tha ing is now With increase h are appro both condit can be seen the tip of e model do lined couple e considered parison to e meters provid l symmetric =210GPa, -5- ation and incre of the conside wed. The opt the closedputer Algeb m reveals i lem is illust are that the from linea r vanishing gularity ord ficiencies of y release ra he following shows the s n the failure an the lowe increased ed energy re oaching eac tions of the n, that the the reentra not play a r ed stress an d single lap experimenta ded from st c steel-epox aE =3GPa. T 1 emental energ ered weak inte timization p -form natur bra System M interesting trated for th e stresses an ar-elasticity g crack leng der of the r f the presen ate are wellg that in the stress distrib load. The er bound for the increme elease and ch other un e coupled c stress and ant corner. role in the e nd energy m p joint on th al results f tandard test xy joint is c The corresp 3th Internation June 1 gy release rate erface model problem can re of the un Mathematic details of e present ca nd hence the theory and ths as it is reentrant co ntly used m -known and e framewor bution and t upper boun r the crack ental energ stresses now til they wil criterion is f energy crit Hence, the valuation of model are pr he failure lo from literatu ts are used considered. ponding Poi nal Conferenc 16–21, 2013, e as a function n be solved b nderlying eq ca in Versio the presen ase of a wea e stress crite d that the i expected fo orner is low model for the d a typical rk of FFM t the increme nd for the c length as p gy release r w the upper ll eventuall found. It is teria are no e previously f the failure resented. Th oad are poin ure is show if available Young's mo isson's ratio ce on Fracture Beijing, China n of the crack by standard quations an on 8. nt modeling ak interface erion do not incremental or the weak wer than the e single lap outcome of they do not ental energy rack length predicted by ate and the r and lower ly coincide. the failure ot evaluated y described e load. he effect of nted out and wn. In this e to predict oduli of the s are e a d n g e t l k e p f t y h y e r . e d d f d s t e
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